Good lord you are an idiot. Anyway, back to the movie.
I have a Theory why Ultron act's different in the movie versus in the comics. In the comics Hank creates Ultron, and he is a reflection of his Dark side which is very dark. In the Movie Ultron actually absorbs a good bit of Tony's personality. You can see it in the conversation with Klaw where he says Lines exactly how Tony would. It makes sense for him to emote more, to be more sarcastic etc because he is part Tony.
Now should they have beaten Ultron that easily? Who knows, Mainly it was Vision that melted him, and Hulk finished him off later with Scarlet Witch. 3 of the most powerful people in the MCU.
Also, I doubt this is the last we see of Ultron. There's no way they could have mopped up his total existence across the world. My guess is Thanos will infuse him with true power. There is so many versions of Ultron in the comics, all upgrades after he has been defeated again and again.